DE19916641C2 - Device for producing a corrugated tube that can be opened and reclosed in its longitudinal direction - Google Patents

Description

The invention relates to a device for producing a in its longitudinal direction openable and reclosable corrugated tube with one in its longitudinal direction running hook profile and an adjacent parallel barb profile, with a spray head and a corrugator with first and second Mold jaw halves that can be moved simultaneously along two endless tracks and the along a common molding path of the two tracks with their End faces lie close together and between them a form channel for the Form corrugated tube, with each first mold jaw half with a first longitudinal groove Formation of the hook profile and with one in the circumferential direction to the first Longitudinal gutter adjacent second longitudinal gutter to form the barb profile is trained.  

Such a corrugated tube is, for example, for the protective sheathing of electrical lines provided and for this purpose with a along a surface line of the corrugated tube extending slot-shaped opening, the edges of which closing elements exhibit. With the help of the closing elements, the longitudinal slot is temporary closable.

DE 196 41 421 A1 describes a device of the type mentioned at the beginning Production of one which can be opened and closed in its longitudinal direction Corrugated tube known. In this known device, the mold jaw halves formed such that they have a along the common molding line Form the shape channel with an elliptical cross-sectional profile. The production of such The shape of the shaped jaw halves is considerable Production effort. The elliptical training is required there in order to to ensure adequate retention of the corrugated pipe. With this Known corrugated pipe, the hook and barb profiles are only in the troughs or only trained on the wave crests. The hook and barb profiles are So in the axial direction of the corrugated pipe on the wave crests or on the wave troughs limited, which is why it is also required there, the wave crests and the Corrugated valleys in the overlap area in the axial direction of the corrugated pipe to train different width dimensions. That also presents you Manufacturing effort to realize the mold jaw halves.

WO 97/32 379 A1 describes a device for producing one in its Corrugated tube that can be opened and closed again in the longitudinal direction with a Spray head and a corrugator with first and second mold halves, the can be moved simultaneously along two endless tracks and those along one common molding line of the two webs with their end faces close together  rest and form a shaped channel for the corrugated tube between them. This However, the device is used to produce a corrugated tube with one in it Longitudinal trough-shaped recess that has a base and two radial spaced apart and parallel to each other Has side surfaces. The base area is lengthways in the neighborhood severed one side surface to form an L-shaped hook. A hook and a barb profile are not there.

DE 17 04 718 B2 describes a device for producing double-walled Plastic pipes with ring-shaped or helical grooved outer wall and smoother Inner wall known with a spray head, which has two ring nozzles, from which in two concentric tubes can be extruded in one operation. The outer tube after emerging from the first ring nozzle, it is Mold jaw halves complementing the hollow shape with transverse grooves and through a pressure difference is applied to the transverse grooves. The inner tube is made from the extruded second ring nozzle lying within the path of the mold jaw halves. The spray head has holes through which air enters the interior of the Inner tube and in the space between the outer and inner tube can be initiated. The two ring nozzles are made of two separate ones, independently controlled extruders. At the mandrel of the ring nozzle, the inner Pipe generated, a mandrel extension is arranged, the outer diameter of which corresponds to the desired inside diameter of the pipe to be manufactured. The thorn this known device is simply cylindrical.

DE 197 05 761 A1 describes a corrugated plastic tube with a longitudinal slot or with an extending in the longitudinal direction of the plastic corrugated tube, substantially through opening known, the opposite  Edge areas of the longitudinal slot are formed at least in sections like this are that they are interconnectable.

DE 22 61 530 C3 describes a freely routable, flexible insulating tube of any type Length made of plastic, the inside of at least two by corresponding Coatings containing mutually insulated electrical cables that contain the light Fill the pipe cross section of the insulating pipe only partially. The insulating tube is on known well-known flexible pleated or corrugated tube. The plastically flexible Insulated electrical cables are loosely arranged in the corrugated or corrugated pipe sufficiently stiff to hold the folded or corrugated pipe in the keep curved shape.

DE 21 02 420 A describes a cladding tube provided in particular for cables Plastic known that has a longitudinal slot, which is preferably by means of a liquid-tight slide closure is closable. This is marked Cladding tube in that it consists of an inner tube with corrugated in the circumferential direction Wall made of relatively hard plastic and a sticking to the inner tube Circumferential direction at least approximately smooth outer or jacket tube from one relatively soft plastic. The jacket or outer tube carries the Closure elements of the liquid-tight slide closure.

From DE 32 46 594 A1 a corrugated tube made of plastic is known for Electrical installation is provided for this purpose with a Longitudinal slot is formed. Along the longitudinal slot, one is the two Detachable snap-lock closure device provided for slit edges.

DE 34 05 552 A1 discloses a thin-walled, cross-corrugated, longitudinally slotted Plastic protective tube for receiving electrical cables. The plastic  The protective tube is formed with a longitudinal slot. On both sides of the longitudinal slot are opposite each other and complementary to each other and / or bulges arranged that can be placed on each other and in particular can be brought into engagement with each other like a push button. Along the slot are wart-like protrusions divided by the slit provided over the Project the outer contour of the pipe and to pass through the lines or one Line branching to form an opening leading to the inside of the pipe can be beheaded.

The invention has for its object a device of the aforementioned To create type in which the mold jaw halves comparatively simple are to be opened in its longitudinal direction and reliable again to create a lockable shaft tube.

This object is achieved in a device according to the preamble of claim 1 in that each first Mold jaw half adjacent to the first longitudinal groove a recessed Has longitudinal recess in which an insert is arranged, which on its Inner end face is formed with the second longitudinal groove.

Through this training, d. H. by using it in the first longitudinal channel adjacent recessed longitudinal recess of each first mold jaw half is a Corrugated tube can be produced in which the hook profile corresponding to the first longitudinal channel and the barb profile corresponding to the second longitudinal channel of the insert - Without interruptions - extend along the corrugated pipe, so that snagging the hook and barb profile along the corrugated pipe according to the invention of the entire corrugated pipe longitudinal extension. This advantage of optimal Interlocking has the further advantage that the mold jaw halves are not  with an elliptical but with a simple semicircular cross-sectional profile getting produced.

The formation of the first mold jaw halves with the radially stepped Longitudinal recess is very simple and time-saving. The production using the longitudinal channel is also very easy, time-saving and precise possible, so that there is an overall advantage that the first mold jaw halves of the device according to the invention can be realized precisely inexpensively.

In order to reliably hook the barb profile with the hook profile of the to achieve the corrugated tube produced according to the invention, it is preferred if the longitudinal channel on the inside face of the insert is a has undercutting barb surface and a wedge surface that with the Barb surface into the inside of the first mold jaw half widening acute angle. Such a longitudinal channel is designed in the respective insert can be manufactured very simply and precisely before the insert is then used in the second recess of the first mold jaw half is fixed. This fixation can For example, by screwing the insert to the first half of the mold respectively.

So not only the barb surface but also the associated hook surface the hook profile of the manufactured with the device according to the invention Corrugated tube forms an undercut in a simple training, it has proven to be useful if the first longitudinal channel and the insert with respect to the plane of symmetry perpendicular to the face of the first mold jaw half asymmetrical, d. H. are provided off-center.  

Taking into account the wall thickness of the device according to the invention to be manufactured or manufactured corrugated tube or in particular in It is the longitudinal direction of the corrugated tube extending hook and barb profile useful if the second longitudinal channel has a depth that is smaller in use than the depth of the transverse shafts of the first mold jaw halves. Is the same purpose it is useful if the inner face of the insert through the second longitudinal groove a first and divided into a second partial end face, the first Partial face to the adjacent end of the inner contour of the cross shafts continuously connected and the second partial end face against the first partial end face is offset radially outward. This latter radial offset of the second Partial face against the first partial face is expediently on the Wall thickness of the corrugated pipe or its longitudinal hook and Adjusted barb profile.

It has proven to be particularly advantageous if the inventive method Device the spray head protruding into the mold channel of the corrugator Has mandrel, which is formed at its distal end with a stopper has a first and a second elevation in the circumferential direction of the plug are spaced from each other in such a way that the first elevation of the for training of the hook profile provided in the first longitudinal channel in the first mold jaw half and the second elevation of those provided to form the barb profile is assigned to the second longitudinal channel in use. It has been shown that through a such training the flow of plastic material through the spray head is optimized into the shape channel of the corrugator, so that with high Productivity precise corrugated tubes with longitudinal hook and Barb profile can be produced. The shape channel of the corrugator can also be used external vacuum and / or with internal pressure to the  plastic material emerging from the spray head along the molding line to the To mold the mold channel of the first and second mold jaw halves.

An embodiment of the device according to the invention or essential Details of the same and a corrugated tube produced with this device are in the drawing is shown schematically and are described below. It demonstrate:

Fig. 1 is a schematic representation of an embodiment of the apparatus for manufacturing a corrugated pipe with a spray head and a corrugator,

Fig. 2 shows a manufactured with the apparatus of FIG. 1 corrugated tube in cross-section,

Fig. 3 in one of the Fig. 2 similar cross-sectional view of the corrugated tube by the longitudinal slots and the re-closing of the longitudinal slot,

Fig. 4 shows a longitudinal section through an embodiment of the spray head of the apparatus according to Fig. 1,

Fig. 5 is a front view of a first and a second mold jaw half of the corrugator of the apparatus of Fig. 1 in the common mold section for forming a molding channel for the corrugated tube,

Fig. 6 in an enlarged scale the detail A in Fig. 5 for clarity of the corresponding profile section of the first mold jaw half,

Fig. 7 on an enlarged scale the detail B in Fig. 5 for clarity of the corresponding portion of the first mold jaw half and the combined therewith insert,

Fig. 8 is a view of the first mold jaw half in the direction of arrows VIII-VIII in Fig. 5,

Fig. 9 is an end view of the insert of FIG. 7,

Fig. 10 is a view of the insert looking in the direction of the arrow X in Fig. 9 on one of its two major surfaces,

Fig. 11 is a view of the second mold jaw half in the direction of arrows XI-XI in Fig. 5,

Fig. 12 is an enlarged view of the detail C in Fig. 11, and

FIG. 13 shows a section along the section line XIII-XIII in FIG. 4 through the plug of the spray head provided at the distal end of the spray head mandrel in combination with the corrugated pipe indicated by thin dash-dotted lines - similar to the cross-sectional profile of the corrugated pipe drawn in FIG. 2.

Fig. 1 shows schematically an embodiment of the device 10 for producing a corrugated tube 12 , as shown in Fig. 2 in cross section. The device 10 has a spray head 14 , as will be described below in connection with FIG. 4. The device 10 also has a corrugator 16 with first mold jaw halves 18 and with second mold jaw halves 20 , of which only a few are schematically indicated in FIG. 1, namely along the mold channel 22 . The first mold jaw halves 18 run along an endless path 24 . The second mold jaw halves 20 run along an endless path 26 . The first and second mold jaw halves 18 and 20 lie closely against one another with their end faces 28 and 30 along the common molding section 22 and form a molding channel 32 for the corrugated tube 12 to be produced from a suitable plastic material.

Fig. 2 shows in cross section an embodiment of the corrugated tube 12 made of plastic material which extend in the circumferential direction and axially spaced equidistantly spaced transverse corrugations 34 has. The transverse shafts 34 are not closed in themselves, but each end on a first end face 36 and on a second end face 38 . A hook profile 40 of the corrugated tube 12 adjoins the second end face 38 and extends in the longitudinal direction of the corrugated tube 12 . The corrugated tube 12 also has a barb profile 42 spaced apart from the hook profile 40 in the circumferential direction, which extends like the hook profile 40 in the longitudinal direction of the corrugated tube 12 . Between the hook profile 40 and the barb profile 42 , the corrugated tube 12 is formed with an outwardly open longitudinal channel 44 , along which the corrugated tube 12 can be slit longitudinally or is slit longitudinally on site. This longitudinal slitting is indicated in Fig. 2 by the two arrows 46 facing each other. After the longitudinal slitting of the corrugated tube 12 , the two longitudinal edges of the corrugated tube 12 are moved together in such a way that the barb profile 42 hooks into the hook profile 40 in order to close the longitudinally slotted corrugated tube 12 again. This reclosed state of the corrugated tube 12 is shown graphically in FIG. 3.

For the precise production of the corrugated tube 12 according to FIG. 2, the first mold jaw halves 18 are each formed with a radially stepped longitudinal recess 48 (see FIGS. 5 to 8). In particular, FIG. 7 clearly shows the stepped longitudinal recess 48 with a first recess 50 , which is provided for forming the hook profile 40 of the corrugated tube 12 , and with a recessed second recess 52 , which is adjacent to the first recess 50 in the circumferential direction, for receiving and fastening an insert 54 (see also FIGS. 9 and 10) is provided. The insert 54 has on its inner end face 56 a longitudinal groove 58 which is used to form the barb profile 42 . The longitudinal groove 58 is formed with an undercut barb surface 60 and with a wedge surface 62 . The undercutting barb surface 60 encloses an acute angle with a plane of symmetry 64 perpendicular to the end surface 30 of the first mold jaw half 18 . The wedge surface 62 includes with the undercutting barb surface 60 an acute angle widening into the interior of the first mold jaw half 18 .

As can be seen from FIGS. 5 to 7, the first recess 50 and the insert 54 with the longitudinal groove 58 for forming the hook profile 40 and the barb profile 42 of the corrugated tube 12 are asymmetrical with respect to the plane of symmetry 64 perpendicular to the end face 28 of the respective first mold jaw half 18 , ie provided laterally offset in the circumferential direction.

The longitudinal channel 58 formed in the insert 54 has a depth starting from the inner end face 56 that is smaller than the radial depth of the transverse shafts 34 of the corrugated tube 12 or the transverse shafts 66 of the respective first mold jaw half 18 . This ensures that the barb profile 42 can hook onto the hook profile 40 (see FIG. 3), the barb profile 42 being positioned in the clear interior of the hook profile 40 . It serves the same purpose if the inner end face 56 of the insert 54 is divided by the longitudinal groove 58 into a first partial end face 68 and into a second partial end face 70 , the first partial end face 68 at the adjoining end 72 of the inner contour 74 of the transverse shafts 66 of the first Mold jaw half 18 connects continuously, as can be seen, for example, from FIG. 6. The second partial end face 70 is offset radially outward against the first partial end face 68 , so that - as can be seen from FIG. 3 - the barb profile 42 and the hook profile 40 do not interfere in the radial direction in the re-closed state of the corrugated tube 12 .

FIG. 4 shows in a longitudinal section an embodiment of the spray head 14 with a mouthpiece 76 which projects into the molding channel 32 of the corrugator 16 of the device 10 (see FIG. 1). The mouthpiece 76 has a central mandrel 78 . The mandrel 78 is formed at its distal end 80 with a stopper 82 , through which an annular slot 84 is determined, through which the plastic material to be extruded for producing the corrugated tube 12 exits into the molding section 22 of the corrugator 16 . The ring slot 84 is connected via a channel 86 to a plastic extruder, not shown. The mandrel 78 is formed with a central through-channel 88 , which is connected in terms of flow technology to a connecting element 90 . The connecting member 90 serves, for example, to connect a compressed air source to the extrutate emerging from the ring slot 84 , ie plastic material in the molding channel 32 of the corrugator 16 of the device 10 (see FIG. 1) against the inner surface of the molding channel determined by the mold jaw halves 18 and 20 32 to align and form the corrugated tube in the shaped channel 32 .

As can be seen from FIG. 13, the plug 82 formed on the distal end 80 of the mandrel 78 is formed with a first elevation 92 and with a second elevation 94 spaced apart therefrom in the circumferential direction. The elevations 92 and 94 are designed, for example, as ribs which extend in the axial direction of the plug 82 . The elevations 92 and 94 are spaced apart from one another in the circumferential direction of the plug 82 in such a way that the first elevation 92 is assigned to the first recess 50 to form the hook profile 40 of the corrugated tube 12 and the second elevation 94 to the longitudinal channel 58 to form the barb profile 42 of the corrugated tube 12 , Through the elevations 92 and 94 on the plug 82 of the mandrel 78 is reliably achieved in a simple manner that the corrugated tube 12 is realized precisely with high productivity not only in the region of its transverse shafts 34 but also along the hook and barb profile 40 and 42 with a defined wall thickness can be.

The same details are given the same reference numerals in FIGS . 1 to 13.

References list

10

contraption

12

corrugated pipe

14

Spray head (from

10

)

16

Corrugator (from

10

)

18

first mold jaw halves (from

16

)

20

second mold jaw halves (from

16

)

22

Molding range (from

16

)

24

endless path (from

18

)

26

endless path (from

20

)

28

End face (of

18

)

30

End face (of

20

)

32

Form channel (from

16

For

12

)

34

Transverse waves (from

12

)

36

first face (from

34

)

38

second face (from

34

)

40

Hook profile (from

12

)

42

Barb profile (from

12

)

44

Longitudinal channel (between

40

and

42

)

46

double arrow

48

stepped longitudinal recess (in

18

)

50

first recess (from

48

)

52

second recess (from

48

)

54

Use in

52

)

56

Inside face (of

54

)

58

Longitudinal channel (an

56

in

54

)

60

undercut barb surface (from

58

)

62

Wedge surface (from

58

)

64

Plane of symmetry (from

18

)

66

Transverse waves (from

18

)

68

first partial end face (from

56

)

70

second partial end face (from

56

)

72

End (of

66

)

74

Inner contour (from

18

)

76

Mouthpiece (from

14

)

78

Thorn (from

14

)

80

distal end (from

78

)

82

Stopper (on

80

)

84

Ring slot (from

76

)

86

Channel (for

84

)

88

central through-channel (in

78

)

90

Connecting organ (for

88

)

92

first survey (at

82

)

94

second survey (an

82

)

Claims (6)

1.Device for producing a longitudinally openable and reclosable corrugated tube ( 12 ) with a longitudinally extending hook profile ( 40 ) and an adjacent parallel barb profile ( 42 ), with a spray head ( 14 ) and a corrugator ( 16 ) with the first and second mold jaw halves ( 18 and 20 ) which can be moved simultaneously along two endless tracks ( 24 and 26 ) and which lie closely against one another with their end faces ( 28 and 30 ) along a common molding path ( 22 ) of the two tracks ( 24 and 26 ) and form between them a shaped channel ( 32 ) for the corrugated tube ( 12 ), each first mold jaw half ( 18 ) having a first longitudinal groove ( 50 ) for forming the hook profile ( 40 ) and a circumferentially adjacent to the first longitudinal groove ( 50 ) second longitudinal groove ( 58 ) for forming the barb profile ( 42 ), characterized in that each first mold jaw half ( 18 ) adjacent to the first longitudinal channel ( 50 ) has a recessed longitudinal recess ( 52 ), in which an insert ( 54 ) is arranged, which is formed on its inner end face ( 56 ) with the second longitudinal channel ( 58 ). 2. Apparatus according to claim 1, characterized in that the second longitudinal groove ( 58 ) on the inner end face ( 56 ) of the insert ( 54 ) has an undercut barb surface ( 60 ) and a wedge surface ( 62 ) with the barb surface ( 60 ) an acute angle that extends into the interior of the first mold jaw half ( 18 ). 3. Apparatus according to claim 1 or 2, characterized in that the first longitudinal groove ( 50 ) and the insert ( 54 ) are provided asymmetrically with respect to the plane of symmetry ( 64 ) perpendicular to the end face ( 28 ) of the first mold jaw half ( 18 ). 4. Device according to one of claims 1 to 3, characterized in that the second longitudinal groove ( 58 ) in the insert ( 54 ) has a depth which is less than the depth of the transverse shafts ( 66 ) of the first mold jaw halves ( 18 ). 5. Device according to one of claims 1 to 4, characterized in that the inner end face ( 56 ) of the insert ( 54 ) is divided by the second longitudinal groove ( 58 ) into a first partial end face ( 68 ) and into a second partial end face ( 70 ), wherein the first partial end face ( 68 ) adjoins the adjoining end ( 72 ) of the inner contour ( 74 ) of the transverse shafts ( 66 ) in a stepless manner, and the second partial end face ( 70 ) is offset radially outward from the first partial end face ( 68 ). 6. Device according to one of the preceding claims, characterized in that in the molding channel ( 32 ) of the corrugator ( 16 ) protruding spray head ( 14 ) has a mandrel ( 78 ) which at its distal end ( 80 ) with a plug ( 82 ) which has a first and a second elevation ( 92 and 94 ) which are spaced apart from one another in the circumferential direction of the stopper ( 82 ) such that the first elevation ( 92 ) is used to form the hook profile ( 40 ) of the corrugated tube ( 12 ) the first longitudinal channel ( 50 ) provided in the first mold jaw half ( 18 ) and the second elevation ( 94 ) is assigned to the second longitudinal channel ( 58 ) provided in the insert ( 54 ) for forming the barb profile ( 42 ).